Pseudotear of the peroneus longus tendon on MRI, secondary to a fibrocartilaginous node.

Skeletal Radiology
Manjiri M DidolkarC A Helms

Abstract

The purpose of this study was to identify the presence of a fibrocartilaginous node within the distal peroneus longus tendon (PLT) just proximal to the cubital tunnel and correlate this with MRI signal characteristics of the distal PLT, which could result in a pseudotear appearance on MRI. We correlated imaging characteristics with pathologic specimens. Institutional review board approval was obtained. Retrospectively, 91 ankle MRIs utilizing a standard ankle protocol were reviewed by two musculoskeletal radiologists. Four cadaver ankles were imaged using a standard ankle MRI protocol and reviewed by the same radiologists. All the MRIs were examined for signal changes in the PLT. The cadaver ankles then underwent PLT dissection by an orthopaedic surgeon, and a pathologic review was undertaken by a pathologist with orthopaedic specialization, who looked for an os peroneum or proposed fibrocartilaginous node relating to the signal change found on the MRIs. In the 91 ankle MRI studies, the PLT demonstrated normal low and increased signals. On the fat-saturated T2-weighted sequence, 76 (83.5%) ankles demonstrated low signal and 15 (16.5%) demonstrated increased signal. Of the cadaver ankle MRIs, all four demonstrated increased sign...Continue Reading

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Citations

Jan 7, 2017·Insights Into Imaging·Stefano BianchiFerdinando Draghi
Feb 17, 2019·Skeletal Radiology·James Thomas Patrick Decourcy HallinanBrady K Huang
Jan 22, 2021·The Journal of the American Academy of Orthopaedic Surgeons·Robert F MurphyJames F Mooney

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